Pseudotemperoceras Schastlivceva, 1986

Pohle, Alexander & Klug, Christian, 2024, Orthoceratoid and coleoid cephalopods from the Middle Triassic of Switzerland with an updated taxonomic framework for Triassic Orthoceratoidea, Swiss Journal of Palaeontology (14) 143 (1), pp. 1-32 : 26-27

Genus Pseudotemperoceras Schastlivceva, 1986

Diagnosis: Trematoceratid with narrow septal spacing and relatively wide siphuncle with expanded segments and suborthochoanitic septal necks.

Type species: Pseudotemperoceras pulchrum Schastlivceva, 1986

Included species: P. nyalamense (Chen, 1981) comb. n.

Remarks: This genus is easily distinguishable from other trematoceratids by its expanded siphuncular segments with suborthochoanitic septal necks and its relatively narrow septal spacing. In addition to the type species, we assign Michelinoceras nyalamense Chen, 1981 from the Induan–Olenekian transition of Tibet to the genus, which is very similar to the type species except for its more widely spaced septa. The same species was also reported from the Anisian of Guizhou, South China, although without figures (Stiller, 2001). We also suspect that the Anisian Phatthalungoceras Tongtherm & Nabhitabhata, 2018 is a junior synonym of Pseudotemperoceras (see below), in which case Phatthalungoceras srisuki Tongtherm & Nabhitabhata, 2018 would constitute a third species. Although the genus has not been documented outside of present-day Asia, tectonic reconstructions indicate that the genus had a very wide distribution during the Early Triassic (compare Fig. 8A).

Occurrence: Siberia, Himalaya, South China? Early Triassic (Induan?, Olenekian), Middle Triassic (Anisian)?